Total Time Reading (TTR)
This is a cumulative metric that quantifies the total number of minutes spent reading a piece of content.
Scroll depth & time on page
A related and simpler metric to acquire is the average time on page (available within Google Analytics).
BuzzFeed’s “Social Lift” metric is a particularly good way of understanding the ‘virality’ of your content (you can see this when you publish a post to BuzzFeed). BuzzFeed calculates “Social Lift” as follows:
((Social Views)/(Seed Views)+1)
Social Views: Traffic that’s come from outside BuzzFeed; for example, referral traffic, email, social media, etc.
Seed Views: Owned traffic that’s come from within the BuzzFeed platform; e.g. from appearing in BuzzFeed’s newsfeed.
Where’s the attribution?